Aik, at 28 weeks pregnant memang perut akan rasa uncomfortable sebab baby growing, tapi kalau it's sharp pain atau persistent kat satu area, better check dengan doctor hari ni juga lah, a few of us had similar worries and our gynae clarified it straightaway. Could be normal stretching, ligament pain, or baby's position, tapi takde salah check awal especially first baby, kan? Just to be safe and give yourself peace of mind.